Packing for pistons



(No Mbd el.) 2 Sheets-Sheet 1.

T. TRIPP.

PACKING FOR PISTONS. No. 352,166. Patnte'd Nov. 9; 1886.

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UNITED j STATES PATENT ()rrrcn.

THOMAS TRIPP, OF EAST STOUGHTON, MASSA OHUSETTS.

PACKING 'l-OR PIS-TONS.

' SPECIFICATION forming part. of Letters. Patent No. 352,166, dated November 9, 1886.

Application filed March 17, 1886. Serial No. 195,517. No model.)

To ctZZ whom it may concern:

Be it known that I, THOMAS TRIPP, of East Stoughton, in-the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Packing for Pistons, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to metallic packing for the pistons of engines and other similar cylinders; and it consists in a certain new and useful construction and arrangement of'the parts of the same, substantially as hereinafter described and claimed.

In the drawings, Figure 1 is a longitudinal central section of an engine-cylinder, showing the piston provided with my improved packing. Fig. 2 is an enlarged transverse section of the piston-head, showing the construction of the packing. Fig. 3 is an end view of the a same with the cap or follower removed to show the arrangement of the parts. Figs. 4 and 5 are edge and side views, respectively, of one of the pieces forming the packing-rings.

A is the steam-cylinder, provided with the steam-ports a d.

P is the piston, composed of a head and stem or rod, 1), iuthe usual form. The pistonhead is formed of a part, c, which composes its hub part, and the flange c on one end, formed as shown inFig. 2. This part is provided with an axial hole through which rod 1) passes and in which it is secured. A collar or projection, c, is formed on the end opposite to the flange c and a ring or follower, 0 corresponding in diameter with the flange 0 is secured in the usual way by means of follower-bolts, leaving a broad groove around the hub part of the member c,'between the ring and flange. This groove receives the packing, which is composed of four pieces, like d, Figs. 4 and 5,fitted together around the hub. Each piece d is formed'sernicircular on its exterior, and with twoplane faces, d d, at each end, on the inside, terminating at a curved innerface, d, in the middle part of pieced, formed so as to be on a curve of a radius less than or the same as the shortest radius from the center of the piston-head, which would touch a point in planes d d. Shoulders d (2 connect curved face d with the plane faces d d at each end of it. the piece d is attached a projecting part, d, Figs. 3 and 4. This projecting part is so formed that it has two outer plane faces, e e, coinciding with the faces d d, a short-curved outer face, 0*, coinciding with and forming an extension of the outer curved face of part d, and lying between faces 0 c, a curved inner face coinciding with and forming an extension of the curved inner face, d", of part d, and two ends coinciding with and forming extensions, respectively, of the shoulders d (P, as shown in Figs. 4 and 5. Four of these pieces like.

as to form a nearly complete ring, and placingdy anddz in the like position, (shown in Fig. 3,) and slipping the projections do and dm inside of the faces d on d" o and d*z, and slipping the like projections (one of which, dflo, is shown in Fig. 1) of parts do and dz inside of the corresponding faces of parts do and do. In this position it will be found that the outer curved faces, 6, of the projections d complete the rings formed by do do and do dz respectively, and that neither part do or do can move outwarduntil dy or dz does, because its projection do or dm lies inside the latter, and that neither part dy or dz can move outward until do and do do, for the same reason; or, in other words, all the segments do da: do dz must move outward simultaneously or not at all. It will also be found that all the transverse joints between segments do do are broken or covered by solid parts dydz, and vice versa, thus preventing the escape of steam through the joints of the packing.

This packing has, therefore, a breadth of bearing for each segment d equal to twice its own all around it, since it not only takes a bearing upon its own surface, but upon that of the segment beside it, and thus renders it impossible for the springs c c to act unequally upon the segments, or one segment, to cut or wear away the cylinder more than another.

On one side of k Other forms of spring-pressure may be employed instead of springs c c, if preferred.

\Vhat I claim as new and of my invention 1S 1. In combination with the piston 1?, four segments, d, arranged around its head and forming an expansible packing, each provided with a laterally-pro ecting part, (1, extending under the ends of two adjacent segments, substantially as described.

2. The combination of the piston-head formed of flange 0 and flange-follower 0", four segments, (1, arranged between the flanges and forming an expansible packing, each provided with a laterally-projecting part, (1, extend- I5 ing under the ends of two adjacent segments, and the sprin gs c 0 between the segments and the hub of the piston-head, substantially as described.

In testimony whereof I have signed my name to this specificati0n,in the presence of two subscribing witnesses, on this 13th day of March, A. D. 1886.

'lI-IOM A S TRIPP. 

